<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>响应式网页</title>
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <link rel="stylesheet" href="css/style.css">
</head>
<body>
<h2>响应式网页</h2>
<div class="main">
    <div class="main1">左半部分主体</div>
    <div class="main1">中间部分主体</div>
    <div class="main1">右半部分主体</div>
</div>

</body>
</html>